Joe Carter offers a good discussion of what is called the Kalam Cosmological argument for the existence of God promoted most notably by philosopher William Lane Craig.
As Carter stresses, an argument is not necessarily a proof. It's always possible to deny one of the premises of the argument and thus evade its force. Even so, if the premises seem reasonable to believe and the argument has a valid structure, then it is reasonable to accept the conclusion. In the case of the Kalam argument the conclusion is that there exists a transcendent, logically necessary, personal, very powerful, very intelligent creator of the universe.
The only question is whether it is reasonable to accept the premises of the Kalam argument. Read Carter's summary and see what you think.
RLC